Power
There are many types of forklifts which are operated by propane gas. Propane-powered forklifts are really simple to refill. The gas is stored inside a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and then the vapor combines with air. The throttle of the forklift is utilized to control the vapor flow. A spark plug ignites the mix of vapor and air creating pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.

As the types of forklifts which are powered by propane have low emissions and are clean burning, they are suitable to be used in warehouses and other buildings.

Hydraulics
The hydraulic system of the forklift is what enables it to raise and transport really heavy objects from place to place. Tubes, cylinders and a pump make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up pushes a piston, that lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is required. Unlike an automobile, a forklift makes use of its back wheels to pivot, that enables the forklift to turn fast on a tight radius.